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The worldwide average age of menarche is very difficult to estimate accurately, and it varies significantly by geographical region, race, ethnicity and other characteristics, and occurs mostly during a span of ages from 8 to 16, with a small percentage of girls having menarche by age 10, and the vast majority having it by the time they were 14. [3]
Menstruation (also called menstrual bleeding, menses or a period) is the first and most evident phase of the uterine cycle and first occurs at puberty. Called menarche, the first period occurs at the age of around twelve or thirteen years. [8] The average age is generally later in the developing world and earlier in the developed world. [42]
Menstruation in synchrony with the moon is widely assumed in myths and traditions as a ritual ideal. [12] [13] The idea that menstruation is—or ideally ought to be—in harmony with wider cosmic rhythms is one of the most tenacious ideas central to the myths and rituals of traditional communities across the world.
Period Books Pre-monarchic 13th century–745 BCE Late 13th century: Song of the Sea [9] 12th–10th: Psalm 29 [10] [11] Late 12th–late 11th: Song of Deborah [12] (alternative datings to the monarchic period [13] have been advanced) 12th–8th: Song of Moses [14] [15] (not including the editorializing layer of Deuteronomy 32:44–32:55) [15 ...
The average age of a girl's first period is 12 to 13 (12.5 years in the United States, [6] 12.72 in Canada, [7] 12.9 in the UK [8]) but, in postmenarchal girls, about 80% of the cycles are anovulatory in the first year after menarche, which declines to 50% in the third year, and to 10% by the sixth. [9]
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